When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Sounds like I may be going with the OEM plug...dont want any misfire issues.
Marcus, looked up indexing but cant pinpoint the link you are trying to establish. Have there been issues with the platinums?
I have never replaced plugs on any car but at 200000km I figured what the hell since I have my valve covers off for gasket replacement and oil breather cover re-sealing I have good access and I'm thinking they have never been replaced.
You mean that thread from 2008 that you replied to that has 0 information as to the 3 plugs i'm comparing??? No....can't have any new info since 2008...
Try being helpful or kick rocks...its not like this forum sees a lot of action and my thread clogs up the community. Save you key strokes if you got nothing for me.
When a plug is indexed, the opening is pointed at the valves. This is opposed to having the ground electrode sitting between the spark and the air fuel mixture (having the opening pointed away from the valves). A +4 plug has 4 ground electrodes and at least one is guaranteed to be in the way. The only engine design that I've ever seen where a +4 could be beneficial is in a rotary.
When a plug is indexed, the opening is pointed at the valves. This is opposed to having the ground electrode sitting between the spark and the air fuel mixture (having the opening pointed away from the valves). A +4 plug has 4 ground electrodes and at least one is guaranteed to be in the way. The only engine design that I've ever seen where a +4 could be beneficial is in a rotary.
Thanks Marcus! Appreciate the explanation. It makes sense. Looks like I will be staying away from Platinums.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
